Lock and switch mechanism for elevator shaft doors



March 26, 1935. J. A. SCHWEIG 1,995,903

LOCK AND SWITCH MECHANISM FOR SHAFT DOORS Filed May 5, 1934 4 Sheets-Sheet 1' Margh 26-, 1935. J. A. SCHWEIG LOCK AND SWITCH MECHANISM FOR ELEVATOR SHAF'I DOORS Filed May 5, 1934 4 Sheets-Sheet 2 1-06 HT-romvEYs March 2%, 1935. J. A. SCHWEIG LOCK AND SWITCH MECHANISM FOR ELEVATOR SHAFT DOORS 4 sheetsshe et. 5

Filed May 5, 1934 /N V5 N TOE:

March 26, E935. J. A. SCHWEIG 1,995,903

L OCK AND SWITCH MECHANISM FOR ELEVATOR SHAFT DOORS I Filed May 5, 1954 4 Sheets-Sheet 4 Patented Mar. 26, 1935 UNITED T ooKANnswIron MEenANIsM 'F'on' Y ELEVATOR snAr'rnoons Julius AQv Sch weig, St-Louis, Mo. I Application lVIay 5, 1934, seria1 No. 72.4,121 w i3 Claims. (01. 1s7- -;54) V I This inventionrelates to 100k and switch.

mechanisms for the motor operated shaft doors of electric elevators It has for. its principal ob-;

ject todevisea cheapand'enicientlock and 5 switch mechanism that will prevent theopening of the shaft doors when the car isnot at a landing and which will prevent the operation of the car until all of the doors in the shaft are closed and locked. Other objects are simplicity of con.- 10. struction, compactness of design, ease of assem-' bly and installation-and easy access to allparts of theglock and switch -mechanism. The invention consists inthe lock and switch mechanism. and inv the combinations.and;arrangements of I 25*: in Fig. 2,

Fig. 4 is a i drive for the door-operating sheaves,

Fig.5 is vertical section on the line 5-5 in Fig. 2, showingthe cami carried by the car diagrammatic view illustrating the 301 for releasing the door lock,

.Fig. 6 is a'front elevational view of the-door lock and switch device and the mounting parts therefor, th 'COVGI' plate of-the housing of the devicegbeing removed to disclose the various switches y. r a 1 s Fig. 7 is a fragmentaryviewof .the lock bar, Fig. 8 is a vertical sectiononthe line 88 in 9 is a horizontal cross-section on the line & 9-'-92in Eig, 6, 2 i1 j Fig. 10 is a vertical section onthe line 10-1-10 ,inFig.9, t ll'isaside elevation 'of a; portion'of a lock and switch [device of modified form,

Fig. 12 is a front view of said'de ice with the cover plate of itshousing removed,"

Fig. 13 is-a vertical section on, the line 13-13 in-'Fig.11; and

Fig. '14 is a wiring diagramishowi'ng the. location of the various switches. in the, different power and control circuits.

Referring to the accompanying drawinga'my invention is shown in connectionwith an electric elevator comprising a shaftiA-havingaqdoor opening Bat each floor which is closed by a vertical sliding door comprising upper andl o wer counterbalanced door sections C and D, respece. tively. Eflclrof said door; sections provided along each vertical edge with an ang'le bar ide rail 1',-havin .8 ,Qutstanding flange slidab y 1:- 5 1 ranged between two of theflanges-oftwo upright angle bar guidesg'z cneof which is, secured to the adjacent jamb member ofthedoor openmg L 1 .The upper'sections are hung on-cablechains 10,

. 3 that pass over sheaves 4 and 4a, located within the shaft- A adjacent the up er s merset the door opening B. 'One end of eachgdoor support -l ing chain is suitably connected --,to .the adjacent:

lower corner. ofthe. upper. door section.-C and; 15- .theother'end of saidchain is connected to 'th e upper end of anuprightrod .5, whose lower end-is secured. to the outer end of an: 311K116 that pIQl: jects'horizontally from the adjacentupper ori ner ofthelowerdoorsection D. --Bythi s I rangementgone' door section acts; as a; counter balance for 1 the other, and-the 'two; gsections ,m ove simultaneouslytowards; and awayfrom each other to. close and open the door; The elevator construction thus, far described "is wellxknownv and .it is considered unnecessary to illustrateit in detail. I v v The door on. each fioor is opened andyclosed by means 'of aseparate doorop'erating mechanism. drivenbya reversible? torque electric motor 'l J which can be stalled under a fullt'load'for several minutes without injury. 'The'electric IIIOtOIJiS' secured to a bracket 8 that is, secured by =boltsttoj the-'adjacent-angle bar door guides .2. The .ar-y mature s'haft 9' ofj'the motor is providedvwith-ia pinion'lO that drives agear 1'1 rotatable with thedoor 'supporting-sheave 4whichis fixed toal shaft 12 journaled in the brack'et 8." This shaft has a small gear l3 fixed thereto that drives a gear 14 fixed to: one end of a shaft '15, which-is journale'd in saidbracket'and has a sprocket wheel ldfixed i to the other e n'd thereot whichf drives an-'endless sprocket chain "1'7 'locatedin arecess 18 provided therefor in the"interiorsurface o'I-the fronfiwall offthe' elevator shaft A just above thelin'tel 1945,]

of the door opening B. Said sprocket chain extends longitudinally 'of said housing to the opposite side of said door opening where itpas'se's around asprocketwheel'20 fixed'tb a shaft 21, which isjournaledin a'bearing22 provided there for in the adjacentdoor guides 2 and has theidoor;

sheave 4a fixed thereto. As shown in the draw? ings, the bracket 8 is provided with a'lubricant ontainin h using 811 within which enclosed the gears lo, i1, 13 and 14. 5,5

The hereinbefore described door operating mechanism which forms the subject matterof my two doorsections are slid apart when the motoris operated in one direction andare brought tocopending application Serial No. '705,501, operates as follows: When the motor '1 is started the, drive thereof is transmitted to the intermeshing gears 10, and 11 to the sheave 4, thence through the intermeshing gears 13 and 14 to the'sprocket wheel 16 and thence through the sprocket chainl'l to the sprocket -wheel 20, which rotates with the sheave 4d. ina direction opposite to the direction inwhich the sheave 4 is rotated. The drive is then'transmitted from the oppositely rotating door sheaves-4 and 4a to the door chains 3 supported thereon, thereby causing the two. door sections C and D to slide in the door guides 2. a The gether when the motor is reversed.

According to the present invention; each vdoor is equipped with a combined lock and switch actuating mechanism mounted on a bracket E that is secured at"its upper andlower ends by bolts 23b. to' the. same angle bar support, the motor supporting bracket 8. The is locatedjopposite the door arm 6 of the lower'door' section D in closed position there bracket "E of and is provided with'a boxor housing 23 having a front opening closed by a" removable cover plate 23a, An upright lock bar 24 is attached atfits 1owe'r end to saiddoor am bymeans of'a screw 25;- and a'guide angle 26 isa bolted to the adjacent door guide 2ftofhold said lock bar in vet ticalposition as it moves up and down with the lower door] sectionD. Said lock bar is'further guided; in a slot 27a provided therefor "in a plate 27 that i's'bolted'to the top of the .box23.

"The lock bar 24 isjprovided with a vertically elongated'slot 24a adapted,"in theclosed position of the lower doorsection D, to be engaged by a lug zs'a atfthe free upperend of an" upstanding lock'arm 28,"whose lower end is fixedto ahori-' zon'tal "rock shaft 29fjournaled in the side walls of the box23ne'ar the upper end thereof. 'The lock 'a'rm 28 is located outside of thebox 23 and iiyis yieldably held'in' locking position against a stop lug 30 by means of a coil spring 31' interposed be-' tween the back of said arm and a lug 32'on the adjacentcside wall of said box. The slot engaging'lug 28a of the lock. arm 28' is provided with a'reduced outer end portion 28b adapted to enter the slot 24a" in the lock bar 24 lwhenthe door is not entirely closed-and theslot is notin a position toirec'eive the-entire lug. v

- Secured to 'thelock armj28 by means of abolt 33 'isan" armx34 whichexterids into the shaft A s and has a roller 35-journaled therein at its outer e'ndadapted to. be engaged bya suitable retiring cam; "36 mounted; on thefelev'ator carF and controlled in the'usual manner from a push button control paneliH mounted in saidcar; The arm 34-may be rotatedon the bolt '33- to adjust the roller 35relative to the cam 36 and then locked in; the desired position -of adjustment by tightening saidbolt; By this arrangement, when the car arrives'at the floor landing,the cam 36 onthe car F will engage. the roller 35 and thus actuate the lock-arm 28 in a direction which will disengageth'e lug 28a from theslot24a in the lock bar 24 and thus permit the door to be opened. When 70 the car is started, the :cam :36 is' retired in the usual manner (not shown), thereby permitting the spring .31tomove the lock arm 28'into en' gagernent with the slot 24a in the lock-bar 24 and thus p'reventopenin'g ofthe' door.

Mounted for vertical sliding movement in a.

door guides 2 that slideway provided therefor in the, rear wall of the switch box 23 below the lock mechanism is a slide bar 37, which is provided at its upper end with a hook '38 that is supported on a lug 39a on the lower arm of a bell crank lever 39. This bell crank lever is located in the box 23 opposite the lock arm 28. and is pivoted for vertical swinging movement on a stud 40 that projects from one side ,wall of the box. The other or upstanding arm of thebell crank lever 39 is providedwith a horizontal pin 41 that engages a in the outer end of a rock arm 42 which is fixed to the lockarm supporting rock shaft 29 for 'ror tation therewith. By this arrangement, when the lock arm 28 is in lockedposition, the slide bar supporting arm of thebell crank lever 39 is in its locked position, said arm of said bell crank lever is in its lowermostposition thereby permitting saidrslidebar to slide downwardly in said box..

10' longitudinal slot 42a uppermost position and said slide bar 37 is raised in the box' 23;- and when said lock arm is in un- Theslide bar supporting arm of thebell crane lever 39 is provided with a convexly curved outer;

end 391) adapted, 1 in the disengaged or unlocked position of 'the-lock'arm 28, to bear against an inclined shoulder 37a on the slide bar 87, thereby preventing upward movement of said slide bar when said lock armis in unlocked position. The sl-ot-and-pin connection 420.,"41 between the other arm of the bell cranklever 39 and the rock arm 42 forms alost motion "connection between'said arms which permits furtheru'nlocking movement of the lock arm when the slide bar has reached the end-of its downward sliding movement.

The slide bar 37 is adapted to operate a pluralityof vertically-spaced circuit opening and "circuit closing switches I, J, K, L and enclosed inthe box23. One element of each of these switches comprisesa' pair of stationary contact posts 43 and' the other element comprises a contact plate 44 movable with the slide bar 37 into and out ofengagement with said contact posts. The stationary contact posts of each switch are fixed to'a fibre insulating block 45, the insulating block for the contact posts of the bottom switch M beingise ,curedto the'bottom of the box 23, and the insulat maining switches said box. Each of'these angles extendsz'crosswise of the slide bar 37=with its ends secured to the rear wall of said box o'nopposite sides of said mg block of the contact postsof eachof the re-' being each fixed to theCoutstanding 'flange' of aseparate-angle 46 fixed to.

slide bar, thereby serving as a means for holding said slide bar in its slideway. The movable 'contact plate 44 of each switchis slida'bly. mounted on a pin 4'7mountedon'a fibjer' insulating block 48 for the 'pin 4'7 and. serves to yieldably holdsaid contact plate against said cotter'pin, With this arrangement when the doortis locked, the slide bar 37 is rais'edand the uppermost switch I'is closed andthe remaining switches are opened; and

when the door is unlocked, said uppermost switch I is open and the remaining switches are closed.

'Theabove' switches are incorporated in an electrical wiring system which may be" divided into three circuits; namely, a power'circuit for the door operator; a control circuit for the door operator; and an elevator control circuit.

, Referring to thewirin diagram shown inlFig,

opening limitswitch T.

14, the =power circuit and door. control icircuit :are coupled to three mam "power Hines, N, 5N 'and N respectively, of ta three phase alternating current circuit. Included :in the powcrwcircuitgrs a mag netic 'swi'tdh O coupled to "the main power lines. .A.-secon'd1ma;gneticzswitchriisiailsogcoupied to said power .line's so as to reverse the-current in two phases :from thatrof switchfml'f 'Iihesnsgntic switch'O is adapted' to stairt the motor 7 to open the door; and the switch i' is adapted tostartsaid 'motor'toclose the' door. A'wire 64 isoonnected Y the switchesfl and K of' the lock and .switch' devic'e of eachdoor. Other wires 65aend 66a are respeetively connected to the-two remaining terminals 0f the magnetic switch P and to the'wires '65 and 66. The other stationary contact posts of the switches J and K of each lock an'd switch 'd'evice are connected to the two remaining terminals of each-motor '7 by wires 67 and 67a, respectively.

completes t'he p'ower circuit-for thedoor op era'tors. f .7 i i .The control circuit for :each door operator comprises a wire 68 connected to the power .line N and to one contact of a toggle stop-switch Q located on thepush button -control panel Him the elevator car :F. Another wire '70 is connectedto the opposite contact terminal-of the stop switch Q and to one contact of :a closing push button switch R and mono contact of an ropening'push button switch S. Boththe closing push button switch R and the ope'ning .push button switch 8 are located on theipush buttoncontrol panelH. The wire 70 isalso connected to one contact of 'door opening limit switch T mounted on the door guide 2 just beiowthe 'box 23. Wire 70a is connected to the other contac'tof the limit switch T and to one contact of a similarly tmounte'd door Wire ;7-6b isconnectedto the other contact of the lirni-t-sw-itch T and to one of a pair of auxiliaryconta'ctso" on magnetic switch 0. A; wire :71 is iconnected-qtoxthe remain ing contact terminal of the opening'push gbutton switch s and to *one end of the magnetic coil of switch 0, and also to the remaining auxiliary contact 0 of saidswi-tch. The opposite end of said magnetic coil is connected by a wire'78 to 'tcn' switch W for "closing the door. v

contacts'of switch V, and one 'o'fth'e contactsof one oi the stationary -contacoiposts 43 0f the switch L ineach sw itchbox =23. 'Ihe 'other stationary-contact post of the switch-L is connected by-a wire 79' tothe power line N. Another wire 72 is connected to the remaining contact of the closing button switch R and --to :one end :of the magnetic coil of switch I; and the other side 0f said magnetic coil is connected vby a wire 78a to the wire, '78. e T

V A push'button control panel'U, preferably of the keyfoperated type, is located on jthe'halll side of each door and is provided withlone push button switch V for opening the door and one pus'h but- One'of the switch W areconnected by wire 'md to one of the contact posts '43of'the switchM. The other contact post of the switch M- is connected-by wire 700 to wire "70. "The remaining contact of the push button switch V is connected by awire' l la to a 'wire -'71; and the remaining contact of the push button switch W is nonnectediby 'awire 7 $7211 to wireiflz; V This completes the *c'ontrol-tcirouit :ror

the door operating mechanism. 1

mally closedswitchlil atieach floor. h wire -B0.is

connected to onetbntactgpost 43 0f theswitchvI P and-at the other end' to'one phase 10fthe el'evatr'yr control circuit. AArwire 8'1 is'iconnectedjto the other contact 'fpost ofthe switch :IofJthei lower.

switch boxand to one contact'post of the switch I of the upperyswitch :box. 7 The remaining con rtao't post-of the switch I of the upperibox is-conmooted by wire 82 'to the other .phase of the ele-, a

vator =control'zcircuit so that when the car switch is operated and switches I are closed; 'aclosed circuitisestablished to operate the elevator.

Referring to Figs; 6 and ltwhentherdoor is closed :and. locked, the switch i is closed by the pressure of the "spring -51 against the contact plate 44andthe circuits ate-witches J,:K, L andxMare open so that both power and control circuits :for the door motors are open and :the doorscannot be operated. However. as t'he :ciricuit for ;the elevator control is closed by theswitch I; the-carwili move-when the car switch is operated to close saidcircuit. 1

'The cam 36 on theea r'l. is retired byipower as the car switch is moved to run the=e1evator. As

shown inl ig. 5, this type of cam isextended by.

gravity (when the car is stopped at a floor landingl and engages the roller -35 of the' lock and switch mechanisms and thereby unlock the door, open the elevator control circuitat switch I -and close tlueqzuzwver and control circuits for the door at the switches J, K," Land Theopening j and closing of the switch I will'preventope ra tion ofthe elevator car and will permit- O eras "The elevator 'control ici'rcuitiincludesthe noition of "the-doors It is noted that as the car ies" engages the le-ver 28 to-operatethe lockcontrolled switches, the elevator control circuit is opened;

first and before the a door operating circuits -are closed. I

i When the elevator carlliK'arr-ives opposite the.

.doorthat is to be opened, the operator opens the car operating circuit switch and thus causes the cam 36 te -engage the roller35 0f the-combined lock and-switchat thatidoor, thereby causing the-cle vator control circuit to open and then closethe power and (control circuits for the door. The operator operatesthe door opening push button S on the control panel H momentari ly.- This causes the power to fio-w between-themain power lines N and N through the-wire -68 to the stop toggieswitch Q,through the wire "70 to the door opening *pushhuttonswitch S, through the wire .71 tjo'the coil-of the magnetic switch 0, through the wire '78. Eto the stationary cont act;;post of switch L and through the wire '79 to the main power :line' N This energizes the coil on switchO, which closesthe contacts thereof, and this establishes a-circuit from. the stop toggle switch "Q through the wire 70 to the limit switcl --T,.through H thewire 70a; to the limit switch Ti, through the Wire 70b to the auxiliary contacts 01, throughthe I wire l-l-to the coilof the magnetic switchi'b, through the wire 78 tothestationary contactpost of the switch L, and through the: wire- 79 to the' main .power lineN'. This will maintain-the mag?- netic-coil-on the switch Q'in theve'n'ergi-zed condition after the :finger is-r'emoved from the do)? openingbuttons and thus allow the. power to flow through the closed switches J and?! to start the motor7to open the door. 1 v fl 1 door then :starts its opening movement under .power, which movement conti'nues until thedoo arm 6 strikes the actuating'lever onithe limitswitc hT, which opensthe circuit between wires'70 and 70a or 70a and 7012. This interrupts the power flow through .the magnetic coil on switch .0, 'thereby causing the contactsthe'reof 5 to open and stop the power flow to the motor '7.

The limit switch T is located a. short distance from the-sill of the door and the momentum of the door will bring it down to the sill.

LJTo' close the -door, the operator pressesthe' closing button switch R. on? the control panel-H of thecar F.- ,It is noted in'this connection that said closing push button switch 'is' arranged so that it must be constantly depressed to operate the door in the closing direction. When the closing button R'isdepressed, power flowsbetween the two main power lines N' and Nfthrough the wires 68 to stop toggle switch Q through the wire "70" to" the' closing push button switch R, through the wire '72 to the magnetic coil onthe switch P, and through the'wires'78a and '78, the

a switch- L, andithe wire '79 to the main power line -N". This" energizes the coil onthe magnetic switch 1?," which closes the contacts thereof to start the motor '7 to close the door, the power continuing to flow to said motor after the door'is closed and until the operator releases? the push button switchR.

I It is-noted that the door canalso be operated from the pushbuttoncontrol panel U located'on thejroomside of the elevator shaft," and that the key push button switch V is connected' by-the wires'7la and '71 to the magnetic coil on switch o to open the door; Thekey pushbutton switch [opening movement of the door.

was connected by wires 72a and '72 to the mag netic switch P toclose the door, and the'open'ing and'closing operating-circuits through the push button panel U are inoperative except when the carzis stopped at the floor landing to causethe switch-M'to close. 40

Elevators having cars equipped with stationary cams require a slightly modified form of door lock and switch device for preventing the openingof-ithe switch -I'of said device and the stopping of the car whenever it'passes thedoor. As

shown in Figs. 11,12 and 13, the modified form of door lock and switch device is provided with an actuating mechanism that'is operated by'the The vertically ,slidable contact bar 37 is provided with a verpin 52b onwhichis sleeved a coil spring 53;

downwardly against the top plate 52a of the slid lock arm 28. r f With this arrangement, downward move'ment of the lower door section D, arm 6 and lock bar tical slot 37b adapted to slidably receive a sup- ,porting member 52 that carries themovable ele move the slide member 52 upwardly and force the contact posts contact plate 44 carried thereby against the 43 of the switch I 'andthus close the circuit controlled thereby. A bell crank 54- is journale'd on a horizontal stud 55 fastened in thebox 23, withone arm 54a in position to press able member 52 and with; the other arm 54b in position to be actuated-by an arm 56 pivoted on the rock shaft 29 that carries the cam actuated 24 will cause the lower end of the lock bar 24 to swing'tlie arm56 inwardly to. actuate the bell crank lever 54 and the sliding member 52 and thereby force, said: member' downwardly against the tension of thespring 53 andopemthe switch I in theelevator control circuit. Duringb'they.

opening movement of the door, theinside face of the lock .bar'24- will bear. againstythelarm 56 the full distance-of the door travel so that the'circuit.-.atiswitchl cannotl be closed until the door isagain completelyclosed.

1 Obviously the above desc [bed door operating mechanism admitsnof. considerablevariation with:

out, departing. from; the spirit of the invention. For instance,;additional sets-of contact either normally closed ,or normally .opened, can be attached in; the-switchmechanism as may be required'for an automatic control system andwhendirect current, power is used. Furthermore, nu-' merous'other changes may be made inthe constructionia'nd location-of the switch mechanism,

door operatingmechanism and motor control circuitillustrated, without departing from". the invention. v,

What I claim is:. v

i v ,1; lnlan electric elevator,-a'shaft, a car work ing therein, doors .for closing the door openings inysaid shaft, electric motors for opening and closing the respective doors, electric powerv and control circuits for said motors, a: circuit for con trolling the.;operation of said'car, a look for each door, aswitch in: said-last,mentioned circuit and associated with each door lock, and switches in said power and control circuits and alsoassociated with said lock,' said,first mentioned switch being closed whensaid'do'or lockhmovesto locking position-and opened in the unlocked'position ofsaid lock, and "said s'econd'mentioned switches being openediin the locked position of said lock and closed: in the unlocked j'position thereof.

..-2. In an' electric elevator, a shaft, a car working therein, .doorsl for'closing thev door openings in saidushaft, electric motors for opening and closing the" respective doors,;'ele'ctric power and,

controlf circuits for said motors, a circuit 1 for I controlling .theoperation of said car, a lockfor each door,qa' switch in. saidlast mentioned; circuit and associated-with'eachdoor lock, and switches in said power and control circuits and associated with said lockjand opened in'such position thereof,

said firstmentione'd switch being openedand said l second mentioned switches being clOsedby the movement of said door locktofunlocked position. 1

3. Inan electric elevator, a shaft, a car'working therein, doorsfo'rclosin'g the door openings in said shaft electric motors; for opening and closing the respective doors, electric powenahd control circuits for said motorsjacircuit'for con-f I trolling'the operation ofthe car,a lock for 'leach door, a switch operated by'each door lockfor closing the car control circuit in thelocking position only of said door lock, switches in-lsaidpower a i rol. q ui sya ada t d, to. b p n in such' pos'ition of said] lock, limit switches in the motor 'controlcircuit' operable and by the "re"- spective doorsatfthe end, of their openingmove ment to opensaid circuit, switches mounted respectiveilyon.thefcar and on the roomside of the elevator shaft for closing the motor control circuit. to open and closethe respective doors, and a switch on said car. and located in the'control' circuit for saidmotors for controlling ,the operation of said doors,

4.'In an electric elevator-,a shaft; a car working therein, doors forclosing the door' openings insa'idrshaft, electric niotorsfonjopening and v5. In an electric elevator,,a=shaft, a carworke ing therein, a vertically slidable' door in said shaft,a n upright lock bar movable with said door, and a locking device for said, door, said device comprising a bracket} secured to said shaft, a lock arm pivoted onsaid bracket for vertical swinging movement into, and out; of lockingen-, gagement with said lock -bar;a spring'for swinging said lock arm: to-locking position, a camon said car for disengaging said, lock arm from said lock bar, an electricswitch' comprising a contact element fixed to; said; bracket and ,a normally closed spring-pressed movable contact element,

1 and, a lever mounted on, said bracketand directly 7 operable by said: lock bar in, the open position of said door to disengage said movable contact element 'fromsaid fixed contact element.

6. In an electric elevator, a shaft, a car working therein, doors for closing the door openingsin said shaft, electric motors for operating the respective doors, a combined lock and switch device for each door, said device comprising a housing secured to the elevator shaft, a lock arm pivoted in said housing and adapted to be auto- ,matically swung into locking engagement with said door in the closed position thereof, an arm adjustably secured to said lock arm, a cam on said car adapted to actuate said arm to release said lockarm from said door, and a plurality of switches mounted in said housing, some of said switches controlling the operation of the door operating motors, each of said switches comprising fixed and movable elements, the movable elements of said switches being operatively connected with said lock arm so as to be actuated thereby.

7. In an electric elevator, a shaft, a car working therein, doors for closing the door openings in said shaft, electric motors for operating the respective doors, a combined lock and switch device for each door, said device comprising a housing secured to the elevator shaft, a lock arm pivoted in said housing and adapted to be automatically swung into locking engagement with said door in the closed position thereof, a cam on said car adapted to release said lock arm a bar slidably mounted in said housing and operatively connected with said arm to be slid thereby in one direction during the movement of said arm ,to locking position and in the opposite direction during the movement of said arm to unlocking position, and a plurality of switches enclosed in said housing, each of said switches comprisingan element fixed to said housing and an element movable with said slide bar into and out of engagement with said fixed element.

8. In an electric elevatona shaft, a car working therein, doors for closing the door openings in said shaft, a locking device for each door, said device comprising a housing secured to said shaft, a lock arm pivoted in said housing and adapted to. be wautdrnatically into, 1ocking:.-engaEe,-.

ment, with. said door'in the closed positionfthere! of; a; cam'onsaid carjadaptedvto release said lock arm, a plurality of switches located insaid house ingz comprisinglfixed and, movable contact e1e.-'

ments; 3 a bar slidablyl" mounted in said/housing and, having the movable: contact elements. fixed thereto, avb'ell; crank-leverlpivotedin said housing with one; arm op'erativelygengaging said .barl to actuate the same, anarm mounted; insaid housing.; for movement withsaid lock arm,andya slotand-pin: connection between; said lastmentioned arm and the other arm of saidbell crank lever.

V 9. Inanelectricelevator, ashaft,a,carworking therein, -doors for closing thedooropeningsf'in' said shaft, electric motors for operating-"the re-: spective doors, electric power. and control circuits for sai'dimotors, an, electric control circuit for-said car,; a. combined lock; and sswitchfldevice for'each door,gsaid device comprising, a 'housingsecured to the elevator shaft, a lock arm-pivoted in said housing and adapted to be automatically; swung J into locking engagement withsaid doorcin the closed position thereof, a cam-on saidcar adapted to release said lock arm, a bar slidably mounted in said housing and having a belllcrankvleven pivoted in saidfihousing with, one armoperatively engaging said bar to actuate the. same, an "arm i mounted in said housing for movementwith said I lock arm, a'slot and-pin: connectiQnb'eftween-said last mentioned, arm and;- the, other y-arm'jof; said bell crank lever, a plurality of switches enclosed in said housing and locatedinthe power and control circuits for the door operating ,motors, and a switch enclosed in said housing/for con-1 necting the motor power and control circuits with v the car control circuits, each of said switches comprising a contact element fixed to said housing and an element movable with 'said slide bar.

10. In an elevator, a shaft, a car' working therein, sliding doors for closing the door operating openings in said shaft, a locking device for each door, said device comprising a, housing fixed tosaid shaft, a lock arm pivoted on said housing, a spring for yieldably holding said of said lock arm .tolocking position, and a lock bar movable with'said door and adapted to hold said lock arm in unlocked position in the open position of said door, said lock bar having a slot therein adapted to be engaged by said lock arm in the closed position of said door.

11. In an elevator, a shaft, a'car working therein, sliding doors for closing the door operating spring for yieldably holding said lock arm in looking position, a cam on said car for moving said lock arm to unlocking position, said housing having a stop thereon for limiting the movementof said lock arm to locking position, a look bar movab le with said door and having a slot therein lock arm in locking position, a cam on said car for moving said lock'arm to unlocking position, said housing having a stop'thereon for limiting the movement V I adapted to be engaged by said lock armin the closed position of said door, a guide on said housing for said lockbar, and a guide onfsaid shaft for said'lock bar, the slot sliding engaging portion ofsaid lock arm terminating at its end in a portion of reduced width.

12. In an electric elevator, a shaft, acar Work-f ing therein, an electric circuitfor controlling the operation of said car, doors for closing the door "76 openings in said shaft, electric motors'for operating thetre'spective I controlcircuits for said motors; 'and a'combined doors; electric poweri and lock and switchde'vice foreach door, saiddevicecomprising a housing 1 secured} to 7 said shaft, "8. lock arm pivoted von saidhousing -and adapted to" automatically swing intolocking engagement withisaid door in the closed position thereof, a

' carn'on. said car for unlockingsaid lock armg a with one: arm of said bell crank lever; a bar slidably mounted in said housing andoperatively connected tothe other arm of said bell crank lever; 15'

bell crank lever pivoted in said housing, an arm; mounted in said housing for movement with said lockt armand] having a" slot-and-pin connection to beactuated'thereby, and a: plurality of electric switches; enclosed in said housing, each-ot said."

. switches comprising a contact element} movable with-said bar and a. contact elementiixed tosaid housing; one ofsaid. switches being adaptedto "2o i c andcontrol circuits interlock the car control circuit with the power for said motors in the lock ing position 'of said'locka'rm, and the remaining "switchesbein'g located insaidmotor' power and controlg circuits and adapted to be opened fin 5 the locked position of said lock arm'andclosed .13.: Inanfi-'electricelevator, ash

of engagement with'the' fixed-contact in the lock- 'motors in'the closed? position of said doo'r, said? fiontrolicircuits'lforvsaid motorsf d icmibined' lock and switch device .for'each door, said' de'vice comprising a' housing secured to said shaft,""a'

lock arm pivoted on s'aidx housing and adapted to automatically swin intolocking engagement 1 5 withsaid door in the closed position 'ther'eot; a

cam on said car foriunlocking said lock arm,v

a bellcranli'leverpivoted' in said housing} anv arm mounted'in" said housing for movement with said lock arm and having a slotandpin connection f with one arm of sjaidbell crank' 'lever, {a bar slidably' mounted in said housingfand operatively connected to th'e other arm of said. ;bell crank lever to be actuated thereby,a plurality of elec-- tric switches enclosed in said housingior making and braking the powerz and control circuits tor 7 said 'motors; each of 'saidi switches comprises a contact member flx'edto' saidhousing anda contact'member movable'with said barintoand out ing and unlocking positions, respecti've1y, of said lock -arm, an independent switch enclosed in' "said housing for interlocki'n'g" the c'ar control circuit with the power and controlycircuits' for said interlocking switchincluding; a normally-, closed i movable contact membenfand means on" said doorcooperating with said lastmentioned con-f tact member forholding it open when the door is open. a

w JULIUS A SCHWEIGI- 

